50M TYPICAL WIRING DIAGRAM 24 VAC CLASS II TRANSFORMER 24 VAC 50M COOL PARK HEAT LO HEAT HI LINE XFMR EAC HUM
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1 21M51U-843 WIIN AND CONFIUATION INTEATED HOT (LINE) TYPICAL WIIN DIAAM 120 VAC NEUTAL (LINE) 24 VAC CLASS II TANSFOME TH 24 VAC T COOL PAK HEAT LO HEAT HI LINE XFM EAC HUM CICU- LATO BLOWE HUMIDIFIE (OPTIONAL) ELECTONIC AI CLEANE (OPTIONAL) INDUCE IN IND HI IND LO IND N IN N CIC N LINE N XFM N HUM N EAC N INITO THEMOSTAT Y2 Y1 Y YLO in other furnace (Trane application) COMPESSIN UNITS TWIN C Twin Application Only FLAME SENSO POBE (Lennox only) HLO HLI FP PS1 MVL MVH ND ND PS2 MV COM T TH FP2 HIH LIMIT OLLOUT (N. C.) SWITCH (N. C.) AUX. HIH LIMIT (N. C.) 2ND STAE PESSUE SWITCH (N. O.) 1ST STAE PESSUE SWITCH (N. O.) AS VALVE LEEND Low Voltage (24 VAC) Line Voltage (120 VAC) N. C. = Normally closed switch N. O. = Normally open switch 178
2 INTEATED 21M51U-843 WIIN AND CONFIUATION TYPICAL WIIN TABLE YLO C Y TEMINAL TWIN MVH (1) PS2 (2) FP (3) ND (4) TH (5) HLI (6) MVL (7) MV COM (8) T (9) ND (10) HLO (11) PS1 (12) IN (1) IND HI (2) IND LO (3) IND N (4) IN N (5) PAK COOL HEAT LO HEAT HI TEMINAL TYPE 8 -screw terminal block 12-pin connector & harness SYSTEM COMPONENT CONNECTION two-stage thermostat terminal (or equivalent) two-stage thermostat terminal (or equivalent) two-stage thermostat terminal (or equivalent) two-stage thermostat terminal (or equivalent) two-stage thermostat Y1 terminal (or equivalent) two-stage thermostat C terminal (or equivalent) two-stage thermostat Y2 terminal (or equivalent) one wire twinning terminal* gas valve SECOND STAE 2nd stage pressure switch INPUT flame sensor probe** MUST BE ELIABLY OUNDED TO CHASSIS 24 VAC transformer (low voltage HIH SIDE) high limit INPUT gas valve FIST STAE gas valve COMMON 24 VAC transformer (low voltage COMMON SIDE) MUST BE ELIABLY OUNDED TO CHASSIS high limit OUTPUT 1st stage pressure switch INPUT ignitor HOT side inducer HIH SPEED HOT side inducer LOW SPEED HOT side inducer NEUTAL side ignitor NEUTAL side unused circulator blower terminal LINE input voltage (120 VAC) HOT SIDE XFM 24 VAC transformer line voltage HOT SIDE EAC (optional) air cleaner HOT side HUM (optional) humidifier HOT side CIC N circulator blower NEUTAL terminal LINE N input voltage (120 VAC) NEUTAL SIDE XFM N 24 VAC transformer line voltage NEUTAL SIDE HUM N (optional) humidifier NEUTAL side EAC N (optional) FP2 5-pin connector & harness 3 /16" spade terminal circulator blower COOL SPEED terminal circulator blower HEAT/FAN LOW SPEED terminal circulator blower HEAT HIH SPEED terminal air cleaner NEUTAL side flame sensor probe** (Lennox applications only) * For TWINNIN applications, use only Controls ** Maximum recommended flame probe wire length is 36 inches. 179
3 21M51U-843 OPEATION INTEATED OPTION SWITCHES Option switches on the control are used to determine the length of the delay-to-fan-off periods. The following tables show the time periods that will result from the various switch positions. OPTION SWITCHES S1-3 & S1-4 POSITIONS HEAT delayto-fan-off: 90 sec.* 120 sec. 150 sec. 180 sec. *Factory default setting On S1, set switch #: 3 4 Off Off Off On On Off On On When using a single stage thermostat, second stage delay is based on the setting of switch S1-1, S1-2 shown below. OPTION SWITCHES S1-1 & S1-2 POSITIONS 2nd Stage delay for single stage thermostats Delay Time: On "S1" set switch # 1 2 Off* Off Off 10 min On Off Auto min Off On 20 min On On *Factory default setting two stage thermostat HEAT MODE In a typical system, a call for first stage heat is initiated by closing the thermostat contacts. The inducer blower is energized at high speed and the control waits for the low pressure switch contacts to close. The humidifier (optional) is also energized at this time. Once the low pressure switch contacts close, a 15-second pre-purge is initiated. Then the inducer changes to low speed and the 120V ignitor is powered. At the end of the ignitor warm-up time, the first stage of the two stage manifold gas valve is energized (low fire). Flame must be detected within 4 seconds. If flame is detected, the 45-second HEAT delay-to-fan-on period begins. After the delay-to-fan-on period ends, the 50M51 control will energize the circulator fan at low heat speed. The electronic air cleaner (optional) will also energize at this time. For a two-stage thermostat, a call for second stage heat ( and ) after a call for first stage heat will energize the inducer at high speed and the circulator at high heat speed. The second stage pressure switch contacts will close and energize the second stage gas valve (high fire). For a single-stage thermostat, when a call for heat occurs (), a 10, 20 minute or auto mode heat staging timer will be activated (timing is selectable with option switches S1-1 and S1-2 positions). Following this delay, the second stage heat is energized as above. The AUTO model algorithm is a method of energizing the second stage gas valve based on the recent average of the heating duty cycle. During a typical heating day, the low to high stage delay is determined by using the average calculated duty cycle from the table below. Once the specified delay time has expired the second stage valve will be energized. See the table below for the different duty cycles. Average Calculated Duty Cycle % Equals Or less than Low to High Stage Delay Demand minutes Light minutes Light to Average minutes Average minutes Average to Heavy minutes Heavy Light minute Heavy When the second stage of the thermostat is satisfied, the inducer motor is reduced to low speed and the second stage gas valve is de-energized. On the 50M51 control, the circulator will remain at high heat speed for 30 seconds following the opening of the second stage gas valve and then is reduced to low heat speed. When the first stage of the thermostat is satisfied, the first stage gas valve is de-energized and the HEAT delay-to-fan-off begins timing. The inducer will postpurge for an additional 15 seconds, then the inducer and humidifier will turn off. Upon completion of the HEAT delay-to-fan-off period, the 50M51 circulator is turned off. The electronic air cleaner on the control is also deenergized at this time. If flame is not detected during the trial-for-ignition period or if the flame is detected/sensed and then lost before completion of 10 seconds of establishment, the gas valve is de-energized, the ignitor is turned off, and the control goes into the retry sequence. The retry sequence provides a 60-second wait with the inducer interpurge following an unsuccessful ignition attempt (flame not detected). After this wait, the ignition attempt is restarted. Two retries will be attempted before the control goes into system lockout. If flame is established for more than 10 seconds after ignition, the 50M51 controller will clear the ignition attempt (or retry) counter. If flame is lost after 10 seconds, the control will restart the ignition sequence. A momentary loss of gas supply, flame blowout, or a shorted or open condition in the flame probe circuit will be sensed within 2.0 seconds. The gas valve will de-energize and the control will restart the ignition sequence. ecycles will begin and the burner will operate normally if the gas supply returns, or the fault condition is corrected, before the last ignition attempt. Otherwise, the control will go into system lockout. If the control has gone into system lockout, it may be possible to reset the control by a momentary power interruption of 10 seconds or longer. efer to SYSTEM LOCKOUT AND DIA- NOSTIC FEATUES. 180
4 INTEATED 21M51U-843 OPEATION COOL MODE In a typical single stage cooling system (Y connection), a call for cool is initiated by closing the thermostat contacts. This energizes the compressor and the electronic air cleaner (optional). The circulator will be energized at cool speed after the COOL delay-to-fan-on period. After the thermostat is satisfied, the compressor is de-energized and the COOL delay-to-fan-off period begins. After the COOL delay-to-fan-off period ends, the circulator and the electronic air cleaner are de-energized. MANUAL FAN ON MODE If the thermostat fan switch is moved to the ON position, the circulator fan (low heat speed) and the electronic air cleaner (optional) are energized. When the fan switch is returned to the AUTO position, the circulator and electronic air cleaner are de-energized. TWINNIN INTEFACE The 50M51 is equipped with a single wire twinning interface. If twinning is used, either control will process a call for heat, cool or fan as described previously. However, after the heat- or cool-on delay time expires, both units will energize the circulator blowers at the same time. Likewise, after the heat- or cool-off delay time expires, both units will de-energize the circulator at the same time. This allows for the proper air flow to be obtained. In a twinned application, the controls are able to communicate no matter how the transformers are phased. To enable twinning, connect the TWIN screw terminals on the 50M51 controls of the furnaces to be twinned to each other using a single wire (14-22 AW). SYSTEM LOCKOUT AND DIANOSTIC FEATUES SYSTEM LOCKOUT When system lockout occurs, the gas valve is de-energized and the low speed inducer blower and the low heat speed circulator are energized. The electronic air cleaner (optional) will also energize at this time. The diagnostic indicator light will flash to indicate the system status. To reset the control after system lockout, do one of the following: 1. Interrupt the call for heat at the thermostat for at least one second but less than 20 seconds (if flame is sensed with the gas valve de-energized, interrupting the call for heat at the thermostat will not reset the control). 2. Interrupt the 24 VAC power at the control for at least 20 seconds. You may also need to reset the flame rollout sensor switch. 3. After one hour in lockout, the control will automatically reset itself. LAST FAULT MODE To retrieve fault codes, push and release the "LAST EO" button for more than 1/5 second and less than 5 seconds. (Control will indicate this period by solid EEN for 1/5 to 5 seconds). The LED will flash up to five stored fault codes, beginning with the most recent. If there are no fault codes in memory, the LED will flash two green flashes. The control will flash the most recent error first and the oldest error last (last in first out). There shall be 2 seconds between codes. Solid LED error codes will not be displayed. FAULT CODE ESET To clear the fault code memory, push and hold the "LAST E- O" button for more than 5 seconds and less than 10 seconds. (Control will indicate this period by APID EEN FLASH for 5 seconds to 10 seconds.) The LED will flash three green flashes when the memory has been cleared. DIANOSTIC FEATUES The 50M51 control continuously monitors its own operation and the operation of the system. If a failure occurs, the red LED on the control will flash a failure code. If the failure is internal to the control, the light will stay on. In this case, the entire control should be replaced, as the control is not field-repairable. If the sensed failure is in the system (external to control), the LED will flash in the following flash-pause sequences to indicate failure status (each flash will last approximately 0.25 seconds, and each pause will last approximately 2 seconds.) During a second-stage error condition, the red LED when in lockout will flash groups of double pulses. The red LED will flash on for approximately 1/15 second then off for 1/15 second then on for 1/15 second, then off for 3/10 second. The pause between groups of flashes is approximately 2 seconds. The diagnostics will indicate the specific fault through the following codes: 181
5 21M51U-843 DIANOSTIC TABLE INTEATED DIANOSTIC TABLE reen LED Flash Amber LED Flash ed LED Flash Error/Condition Comments/Troubleshooting 1 Flame sensed when no flame should be present Verify the gas valve is operating and shutting down properly. Flame in burner assemble should extinguish promptly at the end of the cycle. Check orifices and gas pressure. 2 Pressure switch stuck closed/ inducer error Pressure switch stuck closed. Check switch function, verify inducer is turning off. 3 1st-stage pressure switch stuck open/inducer error Check pressure switch function and tubing. Verify inducer is turning on the pulling sufficient vacuum to engage switch. 4 Open limit switch Verify continuity through rollout switch circuit. 5 Open rollout/open fuse detect Verify continuity through rollout switch circuit, check fuse. 6 1st-stage pressure switch cycle lockout if the first stage pressure switch cycles 5 times (open, closed) during one call for heat from the thermostat the control will lockout. Check pressure switch for fluttering, inconsistent closure or poor vacuum pressure. 7 External lockout (retries) Failure to sense flame is often caused by carbon deposits on the flame sensor, a disconnected or shorted flame sensor lead or a poorly grounded furnace. Carbon deposits can be cleaned with emery cloth. Verify sensor is not contacting the burner and is located in a good position to sense flame. Check sensor lead for shorting and verify furnace is grounded properly. 8 External lockout (ignition recycles exceeded where flame is established and then lost) Check items for exceeded retries listed above and verify valve is not dropping out allowing flame to be established and then lost. 9 rounding or eversed polarity Verify the control and furnace are properly grounded. Check and reverse polarity (primary) if incorrect. 10 Module gas valve contacts energized with no call for heat 11 Limit switch open possible blower failure overheating limit Verify valve is not receiving voltage from a short. If a valve wiring is correct and condition persists, replace module. Possible blower failure, restricted air flow through appliance or duct work. Verify continuity through limit switch circuit and correct overheating cause. 12 Module Ignitor contact failure Fault code indicates the module ignitor contacts are not functioning properly. eplace module. Solid Module - internal fault condition Module contacts for gas valve not operating or processor fault. eset control. if condition persists replace module. apid Twinning error Check wire connections. If condition persists, replace module. 3 double 2nd-stage Pressure Switch Stuck Open/ Inducer Error Check pressure switch function and tubing. Verify inducer is turning on and pulling sufficient vacuum to engage switch. 1 Normal Operation with call for first stage heat Normal operation - first stage 2 Normal Operation with call for second stage Normal operation - first stage heat 3 present with no Second stage call for heat on thermostat circuit with no call for first stage. Verify dip switches are set for two stage thermostat and check thermostat first stage circuit. Configured for a multi-stage thermostat the Module will not initiate heating unless first stage call from thermostat is received. 4 Y present with no call Module will allow cooling to operate with only a "Y signal from the thermostat but will also trigger this code. Verify thermostat is energizing both "Y" and "" on call for cool. Check "" terminal connections. apid Low flame sense current Low flame sense current is often caused by carbon deposits on the flame sensor, a poorly grounded furnace or a mis-aligned flame sense probe. Carbon deposits can be cleaned with emery cloth. Check for improve furnace and module ground. Verify sensor is located in or very near flame as specified by the appliance manufacturer. 1 Standby or Call for Cool Normal operation. Waiting for call from thermostat or receiving thermostat call for cool. 182
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